JP2005228298A - Semiconductor apparatus and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chip having a memory and the like and having a thin-film integrated circuit thin like paper mounted; to provide an extremely thin integrated circuit that uses the chip, has a label attached thereto, and can be mass-produced at a low cost; and to provide a formation method thereof. <P>SOLUTION: This thin-film integrated circuit is formed by a method that can form a pattern selectively, on a glass substrate, a quartz substrate, a stainless substrate, a substrate made of a synthetic resin having flexibility, such as acrylic, or the like except for a bulk substrate. Further, a semiconductor apparatus with the thin-film integrated circuit and an antenna mounted is formed. Thereby, problems wherein an IC card is more expensive than a magnetic card, and an electronic tag is also more expensive as a substitute for bar codes can be solved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a chip having a memory or the like and mounted with a thin thin film integrated circuit like paper, a product or a product with a label using the chip, and a manufacturing method thereof.

In recent years, the number of cards carried per person has increased. Since all information is recorded on the card and rewritten as necessary, the amount of information is steadily increasing.

Such an increase in the amount of information is indispensable across various fields. For example, there is an increasing demand for food products and manufacturing industries to strengthen product safety and management systems, and product information increases accordingly. However, the current product information is mainly provided by a bar code with more than a dozen digits, and information such as the country of manufacture, manufacturer, product number, etc. is general. Also, when using barcodes, it took time because each reading was done manually.

Therefore, a product management method using a network, in which an identifier of a returned product is input from a terminal of each store connected to the network, and information about the product is notified to the store via a server (See Patent Document 1). According to Japanese Patent Application Laid-Open No. 2004-133620, the product identifier is composed of a two-dimensional bar code, a character string, and the like, and is sent to the server via an input to a store terminal. In addition, the product has a removable storage medium that stores programs and data related to the product or personal information, and the storage medium includes cards such as an IC card, a smart card, and a compact flash (registered trademark) card. It is disclosed that

Also, a method has been proposed in which a fine IC chip is mounted on valuable securities to prevent unauthorized use and can be reused when it can be recovered to a regular management source (see Patent Document 2).
JP 2002-230141 A JP 2001-260580 A

With the increase in the amount of information, there has been a limit to the amount of information that can be provided by information management using barcodes. Furthermore, information management by bar code is inefficient because it requires manual reading time. And since barcode reading work is manual, reading errors could not be avoided.

Further, the cost of the IC card is higher than that of the magnetic card, and the electronic tag is also expensive as an alternative to the barcode. As a result, it is limited to applications where added value is important, and is a factor that hinders its spread.

With regard to Patent Document 1, it takes time for consumers to access the Internet, and it is necessary to own a personal computer or the like. Further, in Patent Documents 1 and 2, since the integrated circuit made of a silicon wafer to be used is thick, when it is mounted on a product or a product, particularly paper such as banknotes, or a label attached to the product or the product itself, the surface is uneven. End up. As a result, the design of products and products has been degraded.

Therefore, an object of the present invention is to provide an integrated circuit that can be mass-produced at a low cost unlike a conventional silicon wafer, and a very thin integrated circuit, and a method for forming the integrated circuit.

In view of the above-described problems, the present invention can be achieved by a method capable of selectively forming a pattern other than a bulk substrate such as a glass substrate, a quartz substrate, a stainless steel substrate, and a substrate made of a synthetic resin having flexibility such as acrylic. A thin integrated circuit (hereinafter referred to as a thin film integrated circuit) is formed. Then, a chip on which the thin film integrated circuit and the antenna of the present invention are mounted (hereinafter referred to as an ID chip or a semiconductor device) is formed.

As a method for selectively forming a pattern, a droplet discharge method that selectively discharges (ejects) a droplet (also referred to as a dot) of a composition in which a material such as a conductive film or an insulating film is mixed is used. be able to. The droplet discharge method is also called an ink jet method depending on the method. As a method that can selectively form a pattern, there is a printing method.

Such selectively formed patterns include gate electrodes, source electrodes and drain electrodes, electrodes such as pixel electrodes, wirings such as source wirings and drain wirings, masks for patterning semiconductor films, semiconductor films, and the like. .

A specific ID chip of the present invention includes a thin film transistor having a pattern formed by using a droplet discharge method or a printing method, a thin film integrated circuit having a thin film transistor, and an antenna. It is mounted on the substrate so as to be electrically connected to the board.

The ID chip of the present invention includes a thin film transistor having a pattern formed using a droplet discharge method or a printing method, a thin film integrated circuit having a thin film transistor, and an antenna. The antenna is mounted symmetrically through a thin film integrated circuit, and is mounted on a substrate so as to be connected.

The ID chip of the present invention includes a thin film transistor having a pattern formed by a droplet discharge method or a printing method, a thin film integrated circuit having a thin film transistor, and an antenna, and the antenna is a flexible substrate. The thin film integrated circuit provided on the substrate is mounted on the substrate so as to be electrically connected to the antenna, and the substrate is folded so as to sandwich the thin film integrated circuit therebetween.

Note that in the manufacturing process of the thin film integrated circuit of the present invention, it is not necessary to form all patterns by a method capable of selectively forming patterns. This is because the present invention can achieve the effect by using a method that can selectively form a pattern in one step of a thin film integrated circuit. Of course, a pattern of a plurality of steps may be formed by a method capable of selectively forming a pattern in the manufacturing process of the thin film integrated circuit.

In a specific method for manufacturing an ID chip of the present invention, a thin film integrated circuit is formed over a first substrate by using a droplet discharge method or a printing method in at least one step, and an antenna is formed over the second substrate. The first substrate and the second substrate are attached to each other so that the thin film integrated circuit is electrically connected to the antenna.

In the ID chip manufacturing method of the present invention, a thin film integrated circuit is formed over a first substrate by using a droplet discharge method or a printing method in at least one step, and the flexible substrate is formed over the second substrate. The second substrate is folded so as to sandwich the thin film integrated circuit so that the antenna is formed and the thin film integrated circuit is electrically connected to the antenna.

In the ID chip manufacturing method of the present invention, a thin film integrated circuit is formed over a first substrate and an antenna is formed over a second substrate by using a droplet discharge method or a printing method in at least one step. The first substrate and the second substrate are bonded to each other so that the thin film integrated circuit is electrically connected to the antenna, and then the first substrate is separated from the thin film integrated circuit.

In the ID chip manufacturing method of the present invention, a thin film integrated circuit is formed over a first substrate by using a droplet discharge method or a printing method in at least one step, and a second substrate is bonded to the thin film integrated circuit. The first substrate is peeled from the thin film integrated circuit, an antenna is formed over the third substrate, and the thin film integrated circuit is electrically connected to the antenna. It is characterized by sticking together.

In addition, according to the method for manufacturing an ID chip of the present invention, a thin film integrated circuit is formed over a first substrate by using a droplet discharge method or a printing method in at least one step, an antenna is formed over the thin film integrated circuit, and a thin film The first substrate and the second substrate are attached to each other so that the integrated circuit is electrically connected to the antenna, and then the first substrate is peeled from the thin film integrated circuit.

In the present invention, the antenna can be formed by any one selected from a sputtering method, a droplet discharge method, a printing method, a plating method, a photolithography method, and a vapor deposition method using a metal mask. In addition, after the antenna is formed, the flatness can be improved by pressing by pressing.

The thin film integrated circuit of the present invention can perform information transactions or information management easily and in a short time as compared with information providing means such as a barcode, and can provide a wide variety of information. Furthermore, since the thin film integrated circuit of the present invention is a very thin integrated circuit unlike a conventional silicon wafer, the design is not impaired even when it is attached to a product or the like.

Further, since it is formed on a glass substrate or the like, the cost of a chip, that is, an ID chip can be reduced as compared with a chip made of a conventional silicon wafer. In addition, since a chip made of a silicon wafer takes out the chip from a circular silicon wafer, the shape of the base substrate is limited. On the other hand, in the ID chip of the present invention, the base substrate is an insulating substrate such as glass, and the shape is There are no restrictions. Therefore, productivity can be increased and mass production can be performed. As a result, further cost reduction can be expected. An integrated circuit with a very low unit price, such as a chip, can generate very large profits by reducing unit cost.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the present invention can be implemented in many different modes, and those skilled in the art can easily understand that the modes and details can be variously changed without departing from the spirit and scope of the present invention. Is done. Therefore, the present invention is not construed as being limited to the description of this embodiment mode. Note that in all the drawings for describing the embodiments, the same portions or portions having similar functions are denoted by the same reference numerals, and repetitive description thereof is omitted.

(Embodiment 1)
In this embodiment, an example of a method for manufacturing a thin film integrated circuit mounted on an ID chip will be described.

First, as shown in FIG. 1A, a substrate 100 having an insulating surface is prepared. As the substrate 100, for example, a glass substrate such as barium borosilicate glass or alumino borosilicate glass, a quartz substrate, a stainless steel substrate, or the like can be used. In addition, substrates made of plastics typified by polyethylene-terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), and flexible synthetic resins such as acrylic are generally Although the heat resistant temperature tends to be lower than that of the substrate, it can be used as long as it can withstand the processing temperature in the manufacturing process.

In order to improve the flatness of the substrate, it is preferable to use after polishing the surface by a chemical or mechanical polishing method, so-called CMP method (Chemical-Mechanical Polishing). As the CMP abrasive (slurry), for example, fumed silica particles obtained by thermally decomposing silicon chloride gas dispersed in a KOH-added aqueous solution can be used.

A base film 101 is formed on the substrate 100. The base film is provided in order to prevent alkali metal such as Na or alkaline earth metal contained in the substrate from diffusing into the semiconductor film and adversely affecting the characteristics of the semiconductor element. Therefore, the base film can be formed using an insulating film such as silicon oxide, silicon nitride, silicon nitride oxide, titanium oxide, or titanium nitride that can suppress diffusion of alkali metal or alkaline earth metal into the semiconductor film. .

The base film 101 may have a stacked structure. For example, the silicon nitride oxide film is 10 to 200 nm (preferably 50 to 100 nm) as the first base film, and the silicon oxynitride film is 50 as the second base film. You may laminate | stack in order of -200 nm (preferably 100-150 nm). Note that the silicon nitride oxide film is formed by a plasma CVD method using SiH ₄ , N ₂ O, NH ₃ , H ₂ as a source gas, a pressure of 0.3 Torr (39.9 Pa), an RF power of 50 W, an RF frequency of 60 MHz, The substrate temperature can be 400 ° C. The silicon oxide film is formed by plasma CVD using SiH ₄ and N ₂ O as source gases, a pressure of 0.3 Torr (39.9 Pa), an RF power of 150 W, an RF frequency of 60 MHz, and a substrate temperature of 400 ° C. can do.

The base film is not necessarily provided as long as impurities can be prevented from diffusing into the semiconductor film. Therefore, it is not always necessary to provide a base film in the case where diffusion of impurities does not cause a problem such as a quartz substrate. On the other hand, when using a substrate that contains alkali metal or alkaline earth metal, such as a glass substrate, stainless steel substrate, or plastic substrate, it is effective to provide a base film from the viewpoint of preventing impurity diffusion. is there.

An amorphous semiconductor film 102 is formed over the base film 101. The thickness of the amorphous semiconductor film is 25 to 100 nm (preferably 30 to 60 nm). As the amorphous semiconductor, not only silicon but also silicon germanium can be used. When silicon germanium is used, the concentration of germanium is preferably about 0.01 to 4.5 atomic%. In this embodiment, an amorphous semiconductor film (also referred to as an amorphous silicon film or amorphous silicon) is formed using a semiconductor film containing silicon as its main component.

Next, heat treatment is performed to crystallize the amorphous semiconductor film. The heat treatment can be a heating furnace, laser irradiation, irradiation of light emitted from a lamp instead of laser light (hereinafter referred to as lamp annealing), or a combination thereof.

In the case of using a heating furnace, the amorphous semiconductor film 102 is heated at 500 to 550 ° C. for 2 to 20 hours. At this time, the temperature may be set in multiple stages in the range of 500 to 550 ° C. so that the temperature gradually increases. In the first low-temperature heating step, hydrogen or the like of the amorphous semiconductor film comes out, so that so-called hydrogen dipping that reduces film roughness during crystallization can be performed. Furthermore, it is preferable to form a metal element that promotes crystallization, such as Ni, on the amorphous semiconductor film because the heating temperature can be reduced.

However, when a metal element is formed, there is a concern that the electrical characteristics of the semiconductor element may be adversely affected. Therefore, it is necessary to perform a gettering step for reducing or removing the metal element. For example, a process may be performed so as to capture a metal element using an amorphous semiconductor film as a gettering sink.

When laser irradiation is used, a continuous wave laser (CW laser) or a pulsed laser (pulse laser) can be used. Lasers include Ar laser, Kr laser, excimer laser, YAG laser, Y ₂ O ₃ laser, YVO ₄ laser, YLF laser, YAlO ₃ laser, glass laser, ruby laser, alexandride laser, Ti: sapphire laser, copper vapor One or a plurality of lasers or gold vapor lasers can be used. The beam shape of the laser is preferably linear, and the length of the long axis may be 200 to 350 μm. Further, the laser may have an incident angle θ (0 ° <θ <90 °) with respect to the semiconductor film.

When laser irradiation is used, continuous-wave fundamental laser light and continuous-wave harmonic laser light may be irradiated, or continuous-wave fundamental laser light and pulse-wave harmonics may be emitted. You may make it irradiate with a laser beam.

Note that laser light may be irradiated in an inert gas atmosphere such as a rare gas or nitrogen. Thereby, roughness of the semiconductor surface due to laser light irradiation can be suppressed, and variation in threshold value caused by variation in interface state density can be suppressed.

Alternatively, a crystalline semiconductor film may be formed directly on the surface to be formed. In this case, a crystalline semiconductor film is directly formed on the surface to be formed using heat or plasma using a fluorine-based gas such as GeF ₄ or F ₂ and a silane-based gas such as SiH ₄ or Si ₂ H _6. Can be formed.

The crystalline semiconductor film thus formed is patterned into a predetermined shape, and an island-shaped semiconductor film 103 is obtained. In patterning, a predetermined mask is formed by a photolithography method or a droplet discharge method. Note that it is preferable to form a mask using a droplet discharge method because the material utilization efficiency is improved and the cost and the amount of waste liquid can be reduced. Further, when a mask is formed by a droplet discharge method, the photolithography process can be simplified. That is, photomask formation, exposure, and the like are not required, a reduction in equipment investment cost can be achieved, and manufacturing time can be reduced.

When the droplet discharge method is used, the composition may be discharged in the form of dots or in the form of columns in which dots are connected. Further, the composition is discharged in the form of dots or columns. That is, since a plurality of dots are ejected continuously, they are not recognized as dots and may be ejected in a columnar shape. The discharge of such a composition in the form of dots or columns is referred to as dripping or jetting.

As the mask material, an inorganic material (silicon oxide, silicon nitride, silicon oxynitride, etc.) or a photosensitive or non-photosensitive organic material (polyimide, acrylic, polyamide, polyimide amide, polyvinyl alcohol, resist, or benzocyclobutene) is used. Can do. For example, in the case where a mask is formed using polyimide by a droplet discharge method, heat treatment may be performed at 150 to 300 ° C. in order to perform baking after discharging polyimide to a desired portion by a droplet discharge method.

The crystalline semiconductor film is patterned by a dry etching method or a wet etching method using a mask. After the patterning, plasma treatment is performed to remove the mask. Note that the mask can be functioned as an insulating film without being removed.

After that, an insulating film, a so-called gate insulating film 105 is formed so as to cover the island-shaped semiconductor. The gate insulating film is formed of an insulating film containing silicon with a thickness of 10 to 150 nm, preferably 20 to 40 nm, using a plasma CVD method, a low pressure CVD method, or a sputtering method. Needless to say, the gate insulating film is not limited to the silicon oxynitride film, and another insulating film containing silicon may be used as a single layer or a stacked structure.

Thereafter, a conductive film, a so-called gate electrode 106 is formed over the crystalline semiconductor film with a gate insulating film interposed therebetween. The gate electrode can be formed by a droplet discharge method, a CVD method, or a sputtering method. The gate electrode may be formed of an element selected from Ta, W, Ti, Mo, Al, and Cu, or an alloy material or a compound material containing the element as a main component. Of course, the gate electrode may be a single layer or a stacked layer. For example, a gate electrode in which a tantalum nitride film with a thickness of 10 to 50 nm is formed as the first conductive film 108a and a tungsten film with a thickness of 200 to 400 nm is sequentially stacked as the second conductive film 108b can be formed.

When a gate electrode is formed by a droplet discharge method, as a conductor mixed in a solvent, gold (Au), silver (Ag), copper (Cu), platinum (Pt), palladium (Pd), tungsten (W ), Nickel (Ni), tantalum (Ta), bismuth (Bi), lead (Pb), indium (In), tin (Sn), zinc (Zn), titanium (Ti), or aluminum (Al). A material in which a plurality of these conductors are mixed can be used. Further, alloys made of the above conductors, dispersible nanoparticles thereof, or silver halide fine particles can be used.

For example, when a composition in which metal fine particles are dispersed in an organic solvent is used to form a gate electrode pattern, the metal fine particles have an average particle diameter of 1 to 50 nm, preferably 3 to 7 nm. . Such a composition can be formed using a known method such as an electrolytic method, an atomizing method, or a wet reduction method. Further, when formed by a gas evaporation method, the fine particles protected by the dispersant are as fine as about 7 nm. Further, when the surface of each particle is covered with a coating agent, this fine particle is preferable because it does not aggregate in the solvent, is stably dispersed at room temperature, and exhibits almost the same behavior as a liquid.

In order to efficiently disperse a material such as a conductor, the surface of the conductor to be fine particles may be coated with an organic substance or a conductor. The substance covering the surface may have a laminated structure. The substance covering the surface is preferably conductive, but may be removed by heat treatment or the like even if it has insulating properties. In particular, when copper is used, the surface of the copper fine particles is preferably covered with a material such as nickel (Ni) or nickel boron (NiB) in order to prevent copper from diffusing into the semiconductor film or the like. Moreover, you may coat | cover the dispersing agents, such as an amine, alcohol, and thiol, on the surface. The organic solvent is a phenol resin or an epoxy resin, and a thermosetting or photocurable one is applied.

The viscosity of these compositions may be adjusted by adding a thixotropic agent or a diluent solvent.

In this embodiment, a gate electrode is formed by discharging an appropriate amount of an Ag conductor onto a formation surface by a droplet discharge head using a droplet discharge method.

Thereafter, when it is necessary to remove the solvent in the droplets, heat treatment is performed for baking or drying. Alternatively, the solvent may be cured by light irradiation treatment. Specifically, heating may be performed at a predetermined temperature, for example, 200 ° C. to 300 ° C., and heat treatment is preferably performed in an atmosphere containing oxygen. At this time, the heating temperature is set so that the gate electrode surface is not uneven. In particular, when Ag is used as in this embodiment mode, heat treatment is preferably performed in an atmosphere containing oxygen and nitrogen. For example, the oxygen composition ratio is set to 10 to 25%. Then, since organic substances, such as thermosetting resins, such as an adhesive agent contained in the solvent of the droplets are decomposed, silver (Ag) that does not contain organic substances can be obtained. As a result, the flatness of the gate electrode surface can be improved and the specific resistance value can be lowered. Further, the metal fine particles are brought into contact with each other by volume contraction accompanying the curing of the organic solvent, and fusion, fusion, and aggregation are promoted. That is, a gate electrode in which metal fine particles having an average particle diameter of 1 to 50 nm, preferably 3 to 7 nm are fused, fused, or aggregated is formed. At this time, a gate wiring is also formed. Thus, by forming a state in which the metal fine particles are in surface contact with each other by fusing, fusing or agglomeration, the resistance of the wiring can be reduced.

In the present invention, by forming a wiring pattern using such a composition, it becomes easy to form a gate electrode or a gate wiring pattern having a line width of about 1 to 10 μm. Moreover, even if the diameter of the contact hole for connecting with these electrodes and wirings is about 1 to 10 μm, the composition can be filled therein.

Insulating patterns can be similarly formed by using fine particles of an insulating material instead of metal fine particles.

When the gate electrode is thus formed by a droplet discharge method, a material for the gate insulating film that has high adhesion to the gate electrode material is preferably selected. For example, when Ag is used for the gate electrode, it is preferable to form a gate insulating film made of titanium oxide (TiOx). That is, titanium oxide (TiOx) has both a function as a gate insulating film and an adhesion improving function.

Next, phosphorus (P), which is an impurity element, is added in a self-aligning manner to the region to be an n-channel TFT using the gate electrode 106 as a mask to form an impurity region 108. An impurity region may be formed so as to overlap with the gate electrode due to the wraparound of the impurity element below the gate electrode 106 when the impurity is added. In addition, the side surface of the gate electrode can be tapered to form an impurity region overlapping with the gate electrode.

Thereafter, boron (B), which is an impurity element, is added in a self-aligning manner to the region to be the p-channel TFT with the gate electrode 106 as a mask in a state where the region to be the n-channel TFT is covered with a resist mask. Region 109 is formed.

The thin film transistor thus formed is a so-called top gate type thin film transistor in which a gate electrode is provided above a semiconductor film. A substrate provided with a plurality of such thin film transistors can be referred to as a TFT substrate.

As shown in FIG. 1B, an insulating film 110 and a wiring 112 connected to each impurity region are formed. An organic material or an inorganic material can be used for the insulating film. As the organic material, polyimide, acrylic, polyamide, polyimide amide, resist, benzocyclobutene, siloxane, or polysilazane can be used. Siloxane has a skeletal structure with a bond of silicon (Si) and oxygen (O), and the substituent contains at least hydrogen, or the substituent has at least one of fluorine, alkyl groups, and aromatic hydrocarbons. A polymeric material having a starting material. Polysilazane is formed using a liquid material containing a polymer material having a bond of silicon (Si) and nitrogen (N) as a starting material. As the inorganic material, silicon oxide or silicon nitride can be used. The insulating film can be formed by a plasma CVD method, a low pressure CVD method, a droplet discharge method, a spin coating method, or a dip method. In the case of using a highly viscous raw material, it is preferable to use a droplet discharge method, a spin coating method, or a dip method.

The wiring can be formed by sputtering, CVD, or droplet discharge. As a wiring material, a film made of an element of aluminum (Al), titanium (Ti), molybdenum (Mo), tungsten (W), or silicon (Si) or an alloy film using these elements may be used. In addition, when a wiring is formed by a droplet discharge method, as a conductor mixed in a solvent, gold (Au), silver (Ag), copper (Cu), platinum (Pt), palladium (Pd), tungsten (W) , Nickel (Ni), tantalum (Ta), bismuth (Bi), lead (Pb), indium (In), tin (Sn), zinc (Zn), titanium (Ti), or aluminum (Al). Alloys, these dispersible nanoparticles, or silver halide particles can be used.

In this embodiment mode, an interlayer insulating film and a wiring are formed by a droplet discharge method. At this time, the solvent having the interlayer insulating film material and the solvent having the conductive film material may be discharged at the same time, or the solvent having the interlayer insulating film material may be discharged and then the solvent having the conductive film material may be discharged.

In FIG. 1B, the wiring layer is a single layer, but may be a multilayer. By using a multilayer wiring layer, it is possible to reduce the size of the thin film integrated circuit.

After that, a conductive film 115 for connecting the wiring 112 is formed. The wiring 112 can be referred to for a manufacturing method and a material of the conductive film 115.

As shown in FIG. 1C, an insulating film 116 functioning as a protective film is formed so as to cover the conductive film 115. For the manufacturing method and material of the insulating film 116, the interlayer insulating film 110 can be referred to.

A contact hole for connecting the conductive film 115 to a terminal such as an antenna is formed in the insulating film 116, a conductive film 117 is formed in the contact hole, and a connection terminal portion 118 is formed.

Further, as shown in FIG. 2, the antenna 121 may be integrally formed. In this case, the antenna 121 is formed after the connection terminal portion is formed. Part of the antenna is formed so as to be connected to the connection terminal portion. After that, an insulating film 122 that functions as a protective film is formed. For the manufacturing method and material of the insulating film 122, the interlayer insulating film 110 can be referred to.

When the antenna is formed integrally in this manner, the manufacturing cost of the ID chip on which the antenna is mounted can be reduced. An integrated circuit with a very low unit price, such as an ID chip, can generate very large profits by reducing unit cost.

In FIG. 2, the antenna is formed on the thin film integrated circuit, but the antenna may be integrally formed around the thin film integrated circuit. In this case, the step of forming the insulating film 122 can be omitted, and the thickness of the insulating film can be eliminated.

Further, the antenna can be formed using the same conductive film as the gate electrode, the wiring 112, or the conductive film 115. In this case, the manufacturing process can be eliminated, which is preferable. In particular, when the antenna is formed by a droplet discharge method or a printing method, the gate electrode, the wiring 112, or the conductive film 115 formed in the same layer is also preferably formed by a droplet discharge method or a printing method.

FIG. 1D shows an overall view of the thin film integrated circuit manufactured as described above. As for the thin film integrated circuit, the thin film integrated circuit 120 provided on the substrate 100 is provided with a connection terminal portion 118 in a predetermined region of the integrated circuit.

A variety of information can be provided by such an ID chip on which a very thin thin film integrated circuit is mounted. In addition, information transactions or information management can be performed easily and in a short time by the ID chip. Furthermore, even when an ID chip is attached to a product container together with a label, the design is not impaired because it is very thin.

Further, the thin film integrated circuit of the present invention does not need to be subjected to a back grinding process that causes cracks or polishing marks unlike an integrated circuit manufactured using a silicon wafer. Furthermore, since the thickness variation of the thin film integrated circuit according to the present invention also depends on variations in the film formation of the semiconductor film or the like, it is about several hundred nm at the maximum, and several to several by the back grinding process. Compared with the variation of 10 μm, it can be remarkably reduced.

In addition, the ID chip of the present invention can be formed at a lower cost than a chip made of a silicon wafer. This is because it is formed on a low-cost base substrate such as a glass substrate. In addition, since a chip made of a silicon wafer takes out the chip from a circular silicon wafer, the shape of the base substrate is limited. On the other hand, in the ID chip of the present invention, the base substrate is an insulating substrate such as glass, and the shape is There are no restrictions. Therefore, productivity can be improved and the shape and size of the ID chip can be set freely.

In view of the material for forming the ID chip, a low-cost and safe material is used as compared with a chip formed from a silicon wafer. Therefore, the need for collecting used ID chips is low and it is environmentally friendly. Further, when the ID chip is discarded, it has a certain area, so that it can be cut with scissors or the like, and unauthorized use can be prevented.

In addition, an IC chip manufactured using a silicon wafer may cause radio wave absorption by the silicon wafer, and signal sensitivity may be a problem. In particular, there is a concern about radio wave absorption for the commonly used radio wave of 13.56 MHz or 2.45 GHz. On the other hand, since the ID chip of the present invention is an insulating substrate made of glass or the like, radio wave absorption does not occur. As a result, a highly sensitive ID chip can be formed. Therefore, the area of the antenna included in the ID chip of the present invention can be reduced, and downsizing of the ID chip can be expected.

In addition, a chip formed on a silicon wafer has a semiconducting property, so that the junction is likely to be forward-biased with respect to AC radio waves, and it is necessary to take measures against latch-up. On the other hand, since the ID chip of the present invention forms a thin film integrated circuit on an insulating substrate, there is no such concern.

(Embodiment 2)
In this embodiment, unlike the above embodiment, a method for manufacturing a thin film integrated circuit including a thin film transistor including an amorphous semiconductor film will be described.

As in the above embodiment, a substrate 100 having an insulating surface is prepared as shown in FIG. For the material of the substrate having an insulating surface, the above embodiment mode can be referred to. In this embodiment mode, since a non-crystalline semiconductor film is included, a heating step for crystallizing the semiconductor film is not required. As a result, it is easy to use a substrate made of a synthetic resin having flexibility.

Similarly to the above embodiment mode, surface polishing may be performed on a substrate having an insulating surface in order to improve flatness.

Thereafter, the base film 101 is formed. The above embodiment mode may be referred to for the material of the base film and the manufacturing means. Further, a conductive film such as titanium can be used as a material for the base film. In this case, the conductive film is at least surface oxidized by heat treatment or the like in the manufacturing process. As other base film materials, 3d transition elements (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn) and oxides, nitrides, and oxynitrides thereof can be used. .

In addition, as described in the above embodiment, the base film is not necessarily provided as long as impurities can be prevented from diffusing into the semiconductor film.

Next, the gate electrode 106 is formed over the base film. The above embodiment mode can be referred to for a material or a manufacturing method of the gate electrode. In this embodiment mode, a gate electrode is formed using an Ag conductor by a droplet discharge method.

Thereafter, when it is necessary to remove the solvent in the droplets, heat treatment is performed for baking or drying. The above embodiment mode can be referred to for the heating condition.

When the gate electrode is formed by the droplet discharge method in this manner, the material for the base film is preferably selected from materials having high adhesion to the gate electrode material. For example, when Ag is used for the gate electrode, it is preferable to form a base film made of titanium oxide (TiOx). That is, titanium oxide (TiOx) has both a function as a base film and an adhesion improving function.

After that, an insulating film functioning as a protective film may be provided over the gate electrode. In particular, an insulating film containing silicon nitride is preferably formed over a gate electrode formed using Ag by a droplet discharge method. As a result, oxidation of the gate electrode can be prevented, and planarization of the surface can be improved. On the other hand, it is not preferable to use an insulating film containing oxygen because it reacts with Ag to form silver oxide and roughen the surface of the gate electrode.

After that, a gate insulating film 105 is formed so as to cover the gate electrode. The above embodiment mode may be referred to for a material and a manufacturing method of the gate insulating film. In addition to the above embodiment modes, an insulator made of an organic material such as polysilazane or polyvinyl alcohol can be used as a material for the gate insulating film. The gate insulating film can be formed by a droplet discharge method, a spin coating method, or a dip method. In the case of using a highly viscous raw material, it is preferable to use a droplet discharge method, a spin coating method, or a dip method.

Next, a semiconductor film is formed over the gate insulating film. The semiconductor film can be formed by a plasma CVD method, a sputtering method, a droplet discharge method, or the like. In this embodiment mode, the semiconductor film includes an amorphous semiconductor, a semi-amorphous semiconductor in which an amorphous state and a crystalline state are mixed (also referred to as SAS), and crystal grains of 0.5 nm to 20 nm in the amorphous semiconductor. It may have any amorphous state selected from a microcrystalline semiconductor and a crystalline semiconductor that can be observed. In particular, a microcrystalline state in which grains of 0.5 nm to 20 nm can be observed is called a so-called microcrystal (μc).

The SAS is a semiconductor having an intermediate structure between an amorphous structure and a crystal structure (including single crystal and polycrystal) and having a third state that is stable in terms of free energy. It also contains a crystalline region with short-range order and lattice distortion. A crystal region of 0.5 to 20 nm can be observed in at least a part of the film, and when silicon is the main component, the Raman spectrum shifts to a lower wave number side than 520 cm ^−1. ing. In X-ray diffraction, diffraction peaks of (111) and (220) that are derived from the silicon crystal lattice are observed. Further, as a neutralizing agent for terminating dangling bonds (dangling bonds), SAS contains 1 atomic% or more of hydrogen or halogen.

SAS can be obtained by glow discharge decomposition of a silicide gas. A typical silicide gas is SiH ₄ , and in addition, Si ₂ H ₆ , SiH ₂ Cl ₂ , SiHCl ₃ , SiCl ₄ , SiF _{4 and the} like can be used. The formation of the SAS can be facilitated by diluting the silicide gas with one or plural kinds of rare gas elements selected from hydrogen, hydrogen and helium, argon, krypton, and neon. At this time, it is preferable to dilute the silicide gas so that the dilution rate is in the range of 10 to 1000 times. Further, the SAS can be formed by using Si ₂ H ₆ and GeF ₄ and diluting with helium gas. The reaction generation of the coating by glow discharge decomposition is preferably performed under reduced pressure, and the pressure may be in the range of about 0.1 Pa to 133 Pa. The power for forming the glow discharge may be high frequency power of 1 MHz to 120 MHz, preferably 13 MHz to 60 MHz. The substrate heating temperature is preferably 300 ° C. or less, and a substrate heating temperature of 100 to 250 ° C. is recommended.

In this embodiment, a SAS containing silicon as a main component is formed as a semiconductor film by a plasma CVD method. When a thin film transistor is formed using SAS, the mobility is 1 to 10 cm ² / Vsec.

Next, a semiconductor film having one conductivity type is formed. Note that formation of a semiconductor film having one conductivity type is preferable because contact resistance between the semiconductor film and the electrode is reduced, but the semiconductor film may be provided as necessary. A semiconductor film having one conductivity type can be formed by a plasma CVD method, a sputtering method, a droplet discharge method, or the like.

In the case of forming by a plasma CVD method, a semiconductor film, an N-type semiconductor film, and a gate insulating film can be continuously formed. Specifically, it can be continuously formed without opening to the atmosphere by changing the supply of the source gas into the processing chamber of the plasma CVD apparatus. As a result, it is possible to prevent impurities from adhering to the interfaces of the semiconductor film, the N-type semiconductor film, and the gate insulating film.

After that, the semiconductor film and the N-type semiconductor film are patterned into a desired shape, whereby the island-shaped semiconductor film 103 and the island-shaped N-type semiconductor film 104 are obtained. The above embodiment mode can be referred to for patterning.

Since the semiconductor film and the N-type semiconductor film are simultaneously patterned, the end portions of the island-shaped semiconductor film 103 and the island-shaped N-type semiconductor film 104 are aligned. In other words, the end portions of the island-shaped semiconductor film 103 and the island-shaped N-type semiconductor film 104 are provided so as not to cross each other.

As shown in FIG. 3A, a conductive film functioning as the source and drain electrodes 111 is formed. The conductive film may have either a single layer structure or a stacked structure. For the material and manufacturing method of the conductive film, the above embodiment mode can be referred to. As in the above embodiment, the conductive film can be formed by a sputtering method or a plasma CVD method, and a semiconductor film typified by a polycrystalline silicon film doped with an impurity element such as phosphorus, or an AgPdCu alloy is used. it can.

Further, in the case of using a droplet discharge method, a liquid repellency treatment may be performed in order to improve the liquid repellency on the formation surface of the source electrode and the drain electrode. As the liquid repellent treatment, there is a method of applying a fluorine-based silane coupling agent or the like. As another liquid repellent treatment, plasma treatment using CHF ₃ , O ₂ mixed gas or the like may be performed. Thereafter, when it is necessary to remove the solvent of the droplets, heat treatment is performed for baking or drying.

After that, the N-type semiconductor film 104 is etched using the source and drain electrodes 111 as a mask. This is because the N-type semiconductor film prevents the source electrode and the drain electrode from being short-circuited. At this time, the semiconductor film 103 may be slightly etched.

After that, an insulating film functioning as a protective film may be provided over the source electrode and the drain electrode. In particular, an insulating film containing silicon nitride is preferably formed over a source electrode and a drain electrode which are formed by a droplet discharge method using Ag. As a result, the source electrode and the drain electrode can be prevented from being oxidized and the surface can be planarized. On the other hand, it is not preferable to use an insulating film containing oxygen because it reacts with Ag to form silver oxide and the surfaces of the source electrode and the drain electrode may be roughened.

As described above, the thin film transistor provided with the source electrode and the drain electrode is completed. The thin film transistor in this embodiment is a so-called bottom gate thin film transistor in which a gate electrode is provided below a semiconductor film. More specifically, it is a so-called channel etch type in which the semiconductor film is slightly etched. A substrate provided with a plurality of such thin film transistors is referred to as a TFT substrate.

As shown in FIG. 3B, an insulating film 110 and a wiring 112 are formed. The above embodiment modes can be referred to for the material of the insulating film and the wiring and the manufacturing means. Specifically, a droplet having an insulating film material and a droplet having a conductive film material can be simultaneously discharged from a nozzle. At this time, for example, when a nozzle having two heads is used, the nozzle of each head can be dedicated to a nozzle having an insulating film material or a nozzle having a conductive film material. Further, the insulating film and the conductive film may be formed separately instead of simultaneously. In this case, either the insulating film or the conductive film may be formed first. However, preferably, when the insulating film is formed first, the conductive film pattern is not deformed compared to the case where the fine conductive film is formed first. It can be expected to prevent.

As shown in FIG. 2C, an insulating film 116 functioning as a protective film is formed so as to cover the conductive film 115. For the manufacturing method and material of the insulating film 116, the above embodiment mode can be referred to.

Also in this embodiment, the antenna 121 may be integrally formed as shown in FIG.

As described above, the thin film integrated circuit formed using the channel etch type thin film transistor has been described. However, as shown in FIG. 4, a protective film 130 is provided over the semiconductor film instead of the channel etch type thin film transistor. A thin film integrated circuit may be formed using a so-called channel protective thin film transistor.

FIG. 3D shows an overall view of the thin film integrated circuit manufactured as described above. The ID chip includes a thin film integrated circuit 120 provided on a substrate 100, and a connection terminal portion 118 is provided in a predetermined region of the integrated circuit.

In a thin film integrated circuit using such an amorphous semiconductor film, it is desirable to perform communication using radio waves having a low frequency such as 13.56 MHz. Further, it is suitable for a proximity type in which the communication distance is less than 10 cm or a close contact type in which the communication distance is about several cm.

In this embodiment mode, since a bottom-gate thin film transistor is formed, a thin film integrated circuit can be made very thin. For this reason, the design is not impaired, and it is preferable that the ID chip is mounted on paper such as banknotes.

In addition, since an amorphous semiconductor film is used, there is a concern that the area of the semiconductor film is increased as compared with a crystalline thin film integrated circuit. However, when the ID chip is discarded, it has a certain area, so that it can be easily cut with scissors or the like, and there is an advantage that unauthorized use can be prevented.

Further, a chip made of a conventional silicon wafer is vulnerable to stress. In particular, a thin film integrated circuit using an amorphous semiconductor film may have a large area, and there is a concern about stress breakdown. However, since the ID chip has a certain area compared to the silicon wafer chip, the ID chip is more resistant to stress breakdown, that is, bending stress, by using a highly flexible substrate.

The thin film transistor described in this embodiment is characterized in that a conductive film, a mask, or the like is formed by at least a droplet discharge method. Therefore, the material utilization efficiency is improved, and the cost and the amount of waste liquid can be reduced. In particular, when a mask is formed by a droplet discharge method, the process can be simplified as compared with a photolithography process. As a result, it is possible to reduce capital investment costs, ID chip costs, and manufacturing time.

(Embodiment 3)
In this embodiment, a thin film integrated circuit manufactured by a method different from that in the above embodiment is described. Although the thin film transistor described in Embodiment 1 is described in this embodiment, the thin film transistor described in Embodiment 2 may be used.

As shown in FIG. 5A, a metal film 140 is formed over the substrate 100. As the metal film, an element selected from W, Ti, Ta, Mo, Nd, Ni, Co, Zr, Zn, Ru, Rh, Pd, Os, and Ir, or an alloy material or a compound material containing the element as a main component A single layer made of the above or a laminate of these can be used. For example, the metal film may be formed by a sputtering method using a metal target. Note that the metal film may be formed to have a thickness of 10 nm to 200 nm, preferably 50 nm to 75 nm.

Instead of the metal film, a film in which the metal is nitrided (for example, tungsten nitride or molybdenum nitride) may be used. Instead of the metal film, an alloy film of the above metal (for example, an alloy of W and Mo: W _x Mo _1-X ) may be used. In this case, a plurality of targets such as a first metal (W) and a second metal (Mo) are used in the film forming chamber, or an alloy target of the first metal (W) and the second metal (Mo). What is necessary is just to form by the sputtering method using this. Furthermore, nitrogen or oxygen may be added to the metal film. As an addition method, for example, nitrogen or oxygen may be ion-implanted into the metal film, or a film formation chamber may be formed by a sputtering method with a nitrogen or oxygen atmosphere. At this time, a nitrided metal may be used as a target.

The peeling process can be controlled by such a metal film forming method. That is, when a metal alloy is used, the peeling process can be controlled by controlling the composition ratio of each metal of the alloy. Specifically, it is possible to control the heating temperature for peeling and the necessity of heat treatment. As a result, the process margin can be expanded.

After that, a layer to be peeled 141 is formed on the metal film 140. This layer to be peeled has an oxide film containing silicon, and the oxide film also has a function as a base film. Further, in order to prevent intrusion of impurities and dust from the metal film or the substrate, an insulating film containing nitrogen such as a silicon nitride (SiN) film or a silicon nitride oxide (SiON or SiNO) film may be provided below the semiconductor film. . Such an insulating film formed over the metal film is referred to as a layer to be peeled.

As the oxide film containing silicon, silicon oxide, silicon oxynitride, or the like may be formed by a sputtering method or a CVD method. The thickness of the oxide film containing silicon is preferably about twice or more that of the metal film. In this embodiment, the silicon oxide film is formed to a thickness of 150 to 200 nm by a sputtering method using a silicon target.

When the oxide film containing silicon is formed, an oxide containing the metal (hereinafter referred to as a metal oxide, not shown) is formed on the surface of the metal film 140. The thickness of the metal oxide may be 0.1 nm to 1 μm, preferably 0.1 nm to 100 nm, and more preferably 0.1 nm to 5 nm. The metal oxide is an aqueous solution containing sulfuric acid, hydrochloric acid or nitric acid, an aqueous solution in which sulfuric acid, hydrochloric acid or nitric acid is mixed with hydrogen peroxide, or a thin metal oxide formed on the surface of the metal film by treatment with ozone water. Can also be used. Further, as another method, plasma treatment in an oxygen atmosphere or oxidation treatment may be performed by generating ozone by irradiating ultraviolet rays in an oxygen-containing atmosphere, and heating to about 200 to 350 ° C. using a clean oven. Thus, a metal oxide may be formed.

Next, the semiconductor film 103 and the like are formed over the layer to be peeled 141, whereby the thin film transistor is completed. After that, the insulating film 110 and the connection terminal portion 118 formed with the wiring 112, the conductive film 115, the insulating film 116, and the conductive film 117 connected to each impurity region are formed. The above embodiment mode can be referred to for the manufacturing method and the like of the thin film transistor.

In this manner, the metal film 140, the metal oxide, the layer to be peeled 141, and the semiconductor film are stacked, that is, the semiconductor film is provided on one surface of the layer to be peeled, and the metal oxide is formed on the other surface. It becomes a structure in which an object and a metal film are provided.

After the thin film transistor is formed as described above, at least after the metal oxide is formed, heat treatment is performed to heat the metal oxide. As a result, the metal oxide film is in a crystalline state. For example, when W (tungsten) is used for the metal film, if heat treatment is performed at 400 ° C. or higher, the metal oxide of WO ₂ or WO ₃ becomes a crystalline state. What is necessary is just to determine temperature and necessity for heat processing by the metal film selected. As a result, the metal oxide can be crystallized as necessary, and can be easily peeled off.

Note that the above-described heat treatment can be combined with heat treatment during manufacturing of the semiconductor element. For example, by performing heating after forming the semiconductor film, the semiconductor film can be used as a heat treatment in a so-called hydrogen extraction step in which hydrogen is extracted from the semiconductor film. In the case of forming a crystalline semiconductor film, heat treatment can be performed using a heating furnace or laser irradiation. As a result, manufacturing steps can be reduced.

Next, as shown in FIG. 5B, the thin film integrated circuit 120 formed on the substrate is bonded to the product surface. The product may be curved like the side of the bottle. In this embodiment mode, the substrate is attached to the substrate 142 provided with the antenna 121 and the connection terminal portion 144. At this time, the connection terminal portion 118 of the integrated circuit and the connection terminal portion 143 on the substrate are bonded with an adhesive so as to be connected. As the adhesive, an ultraviolet curable resin, specifically, an adhesive such as an epoxy resin adhesive or a resin additive, a double-sided tape, or the like can be used.

Then, as shown in FIG. 5C, the substrate 100 is peeled off by physical means. At this time, peeling occurs in the crystallized metal oxide layer or at the boundary (interface) between both surfaces of the metal oxide, that is, the interface between the metal oxide and the metal film or the interface between the metal oxide and the layer to be peeled.

At this time, in order to perform peeling easily, a part of the substrate may be cut and scratched with a cutter or the like near the peeling interface on the cut surface, that is, near the interface between the metal film and the metal oxide. Alternatively, a layer to be peeled in a region where no semiconductor element is provided may be scratched.

After peeling off the substrate 100, the metal oxide may be completely removed on the thin film integrated circuit side, or part or most of the metal oxide may be scattered (residual) on the thin film integrated circuit side. If metal oxide remains, it may be removed by etching or the like. At this time, an oxide film containing silicon may be removed.

As described above, a product on which a thin film integrated circuit is mounted can be formed.

In this embodiment mode, the case where the thin film integrated circuit is mounted in a so-called face-down state in which the conductive film of the connection terminal portion faces downward has been described, but the so-called face-up in which the conductive film of the connection terminal portion faces upward. A thin film integrated circuit may be mounted in a state. In this case, wire bonding is preferably used for the conductive film of the connection terminal portion of the integrated circuit and the contact of the antenna or the like.

As described above, the mode in which the thin film transistor is formed over the substrate 100, transferred, and peeled off is described. However, the transfer object or the timing or number of times of peeling is not limited to the above mode. For example, a flexible synthetic resin substrate may be used as an object to be transferred, and a semiconductor film may be transferred to the synthetic resin substrate after forming the metal oxide, and then the thin film transistor may be completed. In particular, in the case where a thin film transistor including an amorphous semiconductor film is formed as in Embodiment Mode 2, a thin film transistor can be completed even after transfer to a synthetic resin substrate. This is because a thin film transistor including an amorphous semiconductor film can be formed at a low heating temperature or without heat treatment. Thereafter, the thin film integrated circuit may be transferred to a printed board or the like. A thin film integrated circuit formed by such transfer and peeling can be mounted on a product in a face-up state or a face-down state.

In the case of peeling, for bonding of the substrate that needs to be peeled off, as an adhesive, a peelable adhesive, for example, an ultraviolet peeling type that peels off by ultraviolet rays, a thermal peeling type that peels off by heat, or a water-soluble that peels off by water Adhesive or double-sided tape may be used. In order to remove the adhesive, it may be irradiated with ultraviolet rays, heated, or washed with water to remove the adhesive.

Although the peeling method using a metal film or the like has been described in this embodiment mode, the substrate 100 may be peeled by another peeling method. For example, the substrate 100 can be peeled off by irradiating the release layer with laser, or the substrate 100 can be peeled off by etching away the substrate 100. Further, a cut can be made in the release layer, and the film can be peeled off with an etchant such as fluorine or chlorine, for example, ClF ₃ .

(Embodiment 4)
In this embodiment, a method for manufacturing an antenna of an ID chip is described.

In order to function as a non-contact type ID chip, a thin film integrated circuit and an antenna are required as described above. The antenna can take various arrangements, and at least a tip of the antenna is provided with a connection terminal for connection to the thin film integrated circuit.

For example, as shown in FIG. 6A, the antenna provided on the substrate 142 is provided so as to meander on a rectangle, and a connection terminal 143 is provided at each end. In FIG. 6A, the connection terminals are provided close to each other, but the present invention is not limited to this. The arrangement of each connection terminal can be determined in accordance with the connection terminal of the thin film integrated circuit.

The antenna may be provided so as to be wound as shown in FIG. A connection terminal 143 is provided at the tip of the antenna. In FIG. 6B, the connection terminals are provided so as to be separated from each other, but may be provided close to each other as shown in FIG.

Further, the antenna may be arranged in a circular shape without being arranged in a rectangular shape.

Next, a method for manufacturing the antenna will be described.

As shown in FIG. 7A, an antenna is formed over the substrate 142 so as to have a predetermined arrangement. As the antenna material, a conductive material such as Ag (silver), Al (aluminum), Au (gold), Cu (copper), or Pt (platinum) can be used. When using Al or Au having relatively high resistance, there is a concern about wiring resistance. However, when the antenna is thick or the antenna formation area is large, the wiring resistance can be reduced by increasing the width of the antenna. For a conductive material such as Cu that is likely to be diffused, an insulating film that functions as a protective film may be formed so as to cover the surface where the antenna is formed or the periphery of Cu. The antenna can be formed by any one of a sputtering method, a droplet discharge method, a printing method, a plating method, a photolithography method, and a vapor deposition method using a metal mask. In particular, when an antenna is formed by a droplet discharge method, a printing method, or a plating method, it is not necessary to pattern the conductive film, so that the number of manufacturing steps can be reduced. In this embodiment mode, the antenna is formed by a droplet discharge method in which a droplet having Ag is discharged from the nozzle 151. At this time, in order to improve the adhesion of Ag, a base film having TiOx or the like may be formed.

When it is necessary to remove the solvent in the droplet after discharging the droplet, a heat treatment is performed for baking or drying. For the heat treatment, the method for manufacturing the gate electrode in the above embodiment can be referred to.

More preferably, pressure is applied as shown in FIG. As a result, the antenna can be thinned, and in addition, the flatness of the antenna surface can be improved. In addition to the pressurizing means 152, a heating means may be provided, and the above heat treatment can be performed simultaneously.

As shown in FIG. 7C, a substrate on which an antenna is formed (hereinafter referred to as an antenna substrate) can be completed. An insulating film that covers the antenna and functions as a protective film may be formed.

Alternatively, an opening 154 may be formed in the substrate 142 and an antenna may be formed in the opening as shown in FIG. Similarly to FIG. 7A, an antenna is formed by a droplet discharge method in which a droplet having Ag is discharged from the nozzle 151. The description of FIG. 7A can be referred to for other antenna materials and manufacturing means.

As shown in FIG. 8B, it is preferable to press the antenna by the pressurizing means 152 as in FIG. 7B. In addition to the pressurizing means 152, a heating means may be provided, and the above heat treatment can be performed simultaneously.

As shown in FIG. 8C, the antenna substrate can be completed. An insulating film that covers the antenna and functions as a protective film may be formed.

In FIG. 8, since the antenna can be formed in the opening, the antenna substrate can be thinned.

(Embodiment 5)
In this embodiment mode, a specific method for mounting a thin film integrated circuit over an antenna substrate will be described.

The thin film integrated circuit formed according to the above embodiment is mounted over the antenna substrate formed according to the above embodiment. As shown in FIG. 9, a set of antenna substrates 150 on which antennas 121 are formed are prepared. The thin film integrated circuit 120 is disposed between the antenna substrates, that is, the antenna substrate is disposed symmetrically via the thin film integrated circuit. Then, it fixes so that each connection terminal part 118 and 143 may connect. You may use the wire bonding method for the means to connect. The ID chip is completed.

Next, a description will be given of so-called multi-sided production in which a plurality of ID chips are produced from a large substrate by the mounting method shown in FIG.

As shown in FIG. 14A, a plurality of (for example, 25) thin film integrated circuits 120 are formed on the large substrate 100. The large substrate 100 is disposed between the antenna substrates 150 and fixed so that the connection terminal portions 118 of the respective thin film integrated circuits are connected to the connection terminal portions 143 of the respective antennas.

After that, as shown in FIG. 14B, a plurality of ID chips are formed on a large substrate and separated by scribing or dicing to complete one ID chip 157. A laser may be used for separating the ID chip. In particular, when an ID chip is cut, it is considered that it is less susceptible to damage at the time of cutting than a chip formed on a silicon wafer. Therefore, the cutting area of the ID chip can be made smaller than the cutting area of the chip formed on the silicon wafer. Therefore, the antenna formation area can be enlarged. Thereafter, the ID chip may be further sealed with an insulating film functioning as a sealing film.

Thus, by obtaining a plurality of ID chips from a large substrate, the cost of the ID chip can be reduced. An integrated circuit with a very low unit price, such as a chip, can make a huge profit by reducing costs.

FIG. 10 shows a method for mounting a thin film integrated circuit by a method different from FIG.

As shown in FIG. 10A, an antenna substrate 150 on which a set of antennas is formed is prepared. As the antenna substrate, a flexible substrate that can be folded from the center, for example, a flexible substrate such as polyethylene terephthalate (PET), vinylidene chloride, vinyl chloride resin, or the like is used.

After that, as shown in FIG. 10B, the antenna substrate is folded so that the thin film integrated circuit 120 is sandwiched therebetween. It is preferable to form notches or recesses in the folds of the antenna substrate so as to be cheap. Then, it fixes so that each connection terminal part 118 and 143 may connect. You may use the wire bonding method for the means to connect. The ID chip is completed.

By providing a set of antennas, one antenna can be used for the power generation circuit and the other antenna can be used for the modulation circuit. As a result, an antenna can be set for each circuit, and the communication distance and sensitivity can be increased. Further, in order to connect the thin film integrated circuit to a set of antennas, it is necessary to form connection terminal portions 118 on both surfaces (upper surface and lower surface) of the thin film integrated circuit.

However, it is necessary to provide an insulating film that functions as a protective film so that each antenna does not short-circuit. Further, a conductive resin may be applied between the connection terminal portions, and an insulating resin may be applied to other regions.

Alternatively, each antenna can be configured not to be short-circuited by opening a contact in the antenna substrate and forming the connection terminal portion of the antenna on the back surface of the antenna substrate (the surface on which the antenna is not provided).

In this embodiment mode, a case where a thin film integrated circuit is mounted between a pair of antenna substrates has been described. However, a thin film integrated circuit may be mounted on one antenna substrate. Moreover, although the antenna is not arranged on the thin film integrated circuit, the antenna may be arranged on the thin film circuit via an insulating film.

Also in the mounting form shown in FIG. 10, the cost of the ID chip can be reduced by forming a plurality of thin film integrated circuits from a large substrate and forming a plurality of antenna substrates from the large substrate.

Next, an example of a functional configuration of the ID chip will be described with reference to FIG.

Reference numeral 400 corresponds to an antenna, and 401 corresponds to a thin film integrated circuit. The antenna 400 includes an antenna coil 402 and a capacitive element 403 formed in the antenna coil 402. The thin film integrated circuit 401 includes a demodulation circuit 409, a modulation circuit 404, a rectifier circuit 405, a microprocessor 406, a memory 407, and a switch 408 for supplying a load to the antenna 400. Note that the memory 407 is not limited to one, and may be a plurality.

A signal transmitted as a radio wave from the reader / writer is converted into an AC electrical signal by electromagnetic induction in the antenna coil 402. The demodulation circuit 409 demodulates the alternating electrical signal and transmits it to the microprocessor 406 at the subsequent stage. The rectifier circuit 405 generates a power supply voltage using an AC electrical signal and supplies the power supply voltage to the subsequent microprocessor 406.

The microprocessor 406 performs various arithmetic processes according to the input signal. The memory 407 stores programs and data used in the microprocessor 406, and can also be used as a work area during arithmetic processing. The signal sent from the microprocessor 406 to the modulation circuit 404 is modulated into an alternating electrical signal. The switch 408 can apply a load to the antenna coil 402 in accordance with an AC electrical signal from the modulation circuit 404. The reader / writer receives the load applied to the antenna coil 402 by radio waves, and can consequently read a signal from the microprocessor 406.

Note that the ID chip shown in FIG. 15 only shows one embodiment of the present invention, and the present invention is not limited to the above structure. The signal transmission method is not limited to the electromagnetic induction method as shown in FIG. 15, and an electromagnetic induction method, a microwave method, or other transmission methods may be used. Moreover, you may have functions, such as GPS, for example.

(Embodiment 6)
In this embodiment, a product on which an ID chip is mounted will be described.

When the antenna substrate is a printed circuit board for a card, it can be used as a card on which an ID chip is mounted (hereinafter referred to as an ID card). FIG. 11A shows a top view of an ID card on which an ID chip is mounted. In the ID card, an antenna 121 provided around the card and a thin film integrated circuit 120 connected to the antenna are mounted.

FIG. 11B is a cross-sectional view taken along line A-A ′ of FIG. Although the thin film integrated circuit and the antenna may be provided in the same layer, in this embodiment mode, the insulating film 160 is formed as a protective film over the antenna, and the thin film integrated circuit is mounted over the insulating film. Therefore, when an antenna provided around the card is connected to a thin film integrated circuit, an antenna (indicated as a lead wire) is formed on the insulating film so as not to be short-circuited with other antennas. Can be connected. The thin film integrated circuit 120 and the antenna 121 are connected via a connection terminal portion. In this embodiment mode, a thin film integrated circuit provided in a face-down state is connected to an antenna. Therefore, each connection terminal portion is connected via the connection wiring 162. Alternatively, the connection terminal portions may be connected using a conductive resin.

Thereafter, a film 161 functioning as a protective film is formed by a laminating method or a printing method in order to perform sealing. An ID card design may be printed on the film.

FIG. 11C illustrates a mode in which an antenna and a thin film integrated circuit are connected by a method different from that in FIG. Since the thin film integrated circuit illustrated in FIG. 11C is provided in a face-up state, the thin film integrated circuit is characterized in that it is connected using a wire 163 by a wire bonding method. Since other structures are similar to those in FIG. 11B, description thereof is omitted.

Note that the thin film integrated circuit and the antenna may be connected as in the above embodiment mode.

As described above, the ID card can be completed.

The ID chip can be used as a tag used as a product or product management means (hereinafter referred to as an ID tag). For example, as shown in FIG. 12A, a barcode 171 on which an ID chip is mounted is attached to a product 170 and used as an ID tag.

FIG. 12B is a cross-sectional view taken along B-B ′ in FIG. An ID chip having the thin film integrated circuit 120 is bonded to the product 170 together with the barcode 171.

Next, a case where an ID chip is attached to a product bottle together with a label is shown.

In FIG. 13A, a plurality of thin film integrated circuits 120 are formed from a large substrate 100. After that, as shown in FIG. 13B, one thin film integrated circuit 120 is separated and mounted on a label 181 on which an antenna 121 is formed. At this time, the connection terminal portion of the thin film integrated circuit and the connection terminal portion 143 of the antenna are fixed to be connected. Note that a peeling technique as described in Embodiment Mode 3 may be used as a method for forming the antenna over the label. Specifically, a layer to be peeled and an antenna are formed over a glass substrate, transferred to a label, and then peeled off. When the peeling technique of the present invention is used, an antenna can be transferred onto an insulating surface having no heat resistance such as a label. In addition, based on the third embodiment, an ID chip integrally formed with an antenna may be transferred to a label. Note that Embodiment Mode 4 may be referred to for a method for manufacturing the antenna.

As shown in FIG. 13C, a thin film integrated circuit and an antenna, that is, an ID chip, are attached to a surface of a bottle 180 having a curved surface together with a label 181.

Such merchandise is arranged on the belt conveyor 183 and the like, and information can be read by passing near the reader device 182. Further, by providing a writer device in addition to the reader device, information can be input to the ID tag or existing information can be rewritten.

Furthermore, since the ID chip can perform information management without contact, the information can be managed by the reader device or the writer device in a state where the product is packed in cardboard or the like. Such an ID chip that performs non-contact communication is referred to as a wireless chip.

By automating the distribution of products equipped with ID chips in this way, labor costs during distribution can be greatly reduced. In addition, human error can be reduced.

Products include food and drinks, clothing, books and the like. In addition, it is possible to simplify product management by attaching ID tags to rental products.

Moreover, since the ID chip of the present invention is very thin, it can be mounted on securities such as banknotes to prevent unauthorized use or simplify management. When an ID chip is mounted on securities, it should be mounted inside the securities so that they cannot be tampered with.

As described above, information on ID chips mounted on or attached to commodities ranges from basic matters such as place, person, and date related to production or manufacture to allergy information, main components, and advertisements. As shown in FIG. 12, when used together with a barcode, it is preferable to input information that does not need to be rewritten, such as the basic information, into the barcode and input rewritable information into the ID chip.

A reader for reading such information may be provided with a reader function in a portable electronic device such as a mobile phone, in addition to a dedicated reader device. In the case of a mobile phone, information on the ID chip can be provided by voice or display on a screen.

Other products equipped with ID chips include mobile phones, watches, bicycles, and the like. For example, by mounting an ID chip on a portable electronic device such as a mobile phone, a settlement function such as a credit card can be provided. In addition, products such as watches that have a wide consumer age group and can be easily worn can be positioned when lost. In addition, when a child carries a product equipped with an ID chip, parents can grasp the current location of the child. Similarly, the current location of a pet can be grasped by mounting an ID chip on the collar of the pet. In addition, a product such as a bicycle, which is frequently stolen, can grasp the current location of the product, and has an effect of preventing theft. Also, if such a product with an ID chip is lost, the current location of the product can be grasped.

It is sectional drawing which showed the manufacturing process of the thin film integrated circuit. It is sectional drawing which showed the manufacturing process of the thin film integrated circuit. It is sectional drawing which showed the manufacturing process of the thin film integrated circuit. It is sectional drawing which showed the manufacturing process of the thin film integrated circuit. It is a cross-sectional view and a perspective view illustrating a manufacturing process of a thin film integrated circuit. It is the top view which showed the antenna. It is sectional drawing which showed the manufacturing process of the antenna. It is sectional drawing which showed the manufacturing process of the antenna. It is the figure which showed the mounting form of the thin film integrated circuit. It is the figure which showed the mounting form of the thin film integrated circuit. It is the figure which showed the card | curd carrying a thin film integrated circuit. It is the figure which showed the thin film integrated circuit attached to goods. It is the figure which showed the merchandise management which attached | subjected the thin film integrated circuit. It is a diagram showing a manufacturing process of a thin film integrated circuit. It is the figure which showed the functional structure of ID chip.

Claims (19)

A thin film transistor having a pattern formed using a droplet discharge method or a printing method, a thin film integrated circuit having the thin film transistor, and an antenna,
The thin film integrated circuit is mounted on a substrate so as to be electrically connected to the antenna. A thin film transistor having a pattern formed using a droplet discharge method or a printing method, a thin film integrated circuit having the thin film transistor, and an antenna,
The semiconductor device, wherein the thin film integrated circuit is mounted on a substrate so as to be electrically connected to the antenna, and the antenna is provided symmetrically via the thin film integrated circuit. In claim 1 or 2,
The semiconductor device is characterized in that the antenna is provided over the thin film transistor. A thin film transistor having a pattern formed using a droplet discharge method or a printing method, a thin film integrated circuit having the thin film transistor, and an antenna,
The antenna is provided on a flexible substrate,
The thin film integrated circuit is mounted on a substrate so as to be electrically connected to the antenna, and the substrate is folded so as to sandwich the thin film integrated circuit therebetween. In any one of Claims 1 thru | or 4,
2. The semiconductor device according to claim 1, wherein the thin film integrated circuit is provided on any one of a glass substrate such as barium borosilicate glass and alumino borosilicate glass, a quartz substrate, a stainless steel substrate, and a synthetic resin substrate. In any one of Claims 1 thru | or 5,
A semiconductor device comprising a thin film transistor including a semiconductor film in an amorphous state. In any one of Claims 1 thru | or 6,
The semiconductor device, wherein the thin film integrated circuit is electrically connected to the antenna by a wire bonding method. In any one of Claims 1 thru | or 7,
The semiconductor device, wherein the antenna includes any one of Ag, Al, Au, Cu, and Pt. In any one of Claims 1 thru | or 8,
The semiconductor device according to claim 1, wherein the pattern is a wiring or an electrode formed by dropping fine particles having an average particle diameter of 1 to 50 nm. A card on which the semiconductor device according to claim 1 is mounted. A tag equipped with the semiconductor device according to claim 1. A thin film integrated circuit is formed on the first substrate using a droplet discharge method or a printing method in at least one step,
Forming an antenna on the second substrate;
A method for manufacturing a semiconductor device, wherein the first substrate and the second substrate are attached to each other so that the thin film integrated circuit is electrically connected to the antenna. A thin film integrated circuit is formed on the first substrate using a droplet discharge method or a printing method in at least one step,
An antenna is formed over a flexible second substrate;
A method for manufacturing a semiconductor device, wherein the second substrate is folded so as to sandwich the thin film integrated circuit so that the thin film integrated circuit is electrically connected to the antenna. A thin film integrated circuit is formed on the first substrate using a droplet discharge method or a printing method in at least one step,
Forming an antenna on the second substrate;
After bonding the first substrate and the second substrate so that the thin film integrated circuit is electrically connected to the antenna, the first substrate is peeled from the thin film integrated circuit. A method for manufacturing a semiconductor device. A thin film integrated circuit is formed on the first substrate using a droplet discharge method or a printing method in at least one step,
Bonding a second substrate on the thin film integrated circuit;
Peeling off the first substrate from the thin film integrated circuit;
Forming an antenna on a third substrate;
A method for manufacturing a semiconductor device, wherein the second substrate and the third substrate are attached to each other so that the thin film integrated circuit is electrically connected to the antenna. A thin film integrated circuit is formed on the first substrate using a droplet discharge method or a printing method in at least one step,
Forming an antenna on the thin film integrated circuit;
After bonding the first substrate and the second substrate so that the thin film integrated circuit is electrically connected to the antenna, the first substrate is peeled from the thin film integrated circuit. A method for manufacturing a semiconductor device. In any one of Claims 12 thru | or 16,
A method for manufacturing a semiconductor device, wherein the antenna is formed by any one selected from a sputtering method, a droplet discharge method, a printing method, a plating method, a photolithography method, and a vapor deposition method using a metal mask. In any one of Claims 12 thru | or 17,
Forming the antenna by any one selected from a sputtering method, a droplet discharge method, a printing method, a plating method, a photolithography method and a vapor deposition method using a metal mask;
A manufacturing method of a semiconductor device, wherein pressure is applied to the antenna. In any one of Claims 12 thru | or 18,
Forming a metal film and an oxide film having silicon on the metal oxide film between the first substrate and the thin film integrated circuit;
Forming a metal oxide having a metal of the metal oxide film on the surface of the metal film;
A method for manufacturing a semiconductor device, comprising: peeling off the first substrate from an interface between the oxide and the metal film or an interface between the metal oxide and the oxide film containing silicon.

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